Armchair



FIG. 1 is a front elevational view of an armchair showing my new design;

FIG. 2 is a rear elevational view;

FIG. 3 is a top plan view;

FIG. 4 is a bottom plan view; and,

FIG. 5 is a right side elevational view, the left side being a mirrorimage thereof.

The ornamental design for an armchair, as shown and described.